The first FF movie sold more tickets than Thor and Captain America in the states, it just didn't make as much because ticket prices were lower in 2005 and it didn't have expensive 3D tickets to help it out. My point is that obviously there is a market for an F4 movie, add in the expanding international market and there is an even bigger market. They should keep the budget down though because reboots so close to the original have a limit on how much they can make if they aren't Spider-Man related. It's going to take at least 140-150mil to do it right though.